216658939381327 has 2 divisors, whose sum is σ = 216658939381328. Its totient is φ = 216658939381326.

The previous prime is 216658939381309. The next prime is 216658939381399. The reversal of 216658939381327 is 723183939856612.

216658939381327 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 216658939381327 - 2³⁵ = 216624579642959 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 216658939381327.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (216658939387327) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108329469690663 + 108329469690664.

It is an arithmetic number, because the mean of its divisors is an integer number (108329469690664).

Almost surely, 2^{216658939381327} is an apocalyptic number.

216658939381327 is a deficient number, since it is larger than the sum of its proper divisors (1).

216658939381327 is an equidigital number, since it uses as much as digits as its factorization.

216658939381327 is an evil number, because the sum of its binary digits is even.

The product of its digits is 705438720, while the sum is 73.

The spelling of 216658939381327 in words is "two hundred sixteen trillion, six hundred fifty-eight billion, nine hundred thirty-nine million, three hundred eighty-one thousand, three hundred twenty-seven".